<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>sessionStorage</title>
</head>

<body>
  <h2>sessionStorage</h2>
  <button onclick="saveData()">点我保存一个数据</button>
  <button onclick="readData()">点我读取一个数据</button>
  <button onclick="deleteData()">点我删除一个数据</button>
  <button onclick="deleteAllData()">点我删除全部数据</button>

  <script type="text/javascript">
    let p = {name: "张三", age: 18};
    
    function saveData() {
      window.sessionStorage.setItem('name', "Li");
      window.sessionStorage.setItem('msg', 666);
      window.sessionStorage.setItem('person', JSON.stringify(p));
    }

    function readData() {
      console.log(window.sessionStorage.getItem('name'));
      console.log(window.sessionStorage.getItem('msg'));

      let person = window.sessionStorage.getItem('person');
      console.log(JSON.parse(person))
    }

    function deleteData() {
      window.sessionStorage.removeItem('msg');
    }

    function deleteAllData() {
      window.sessionStorage.clear();
    }
  </script>
</body>

</html>